论文部分内容阅读
最近三十年,英国小麦的单位面积平均产量翻了一番,迄至1978年,每公顷已超过5吨,总产几乎达到同一时期的三倍。同时,小麦播种面积也有扩大。Silvey(1979)根据英国全国农业植物研究所的产量试验资料推断,全国增加的产量,大约有一半要归功于品种改良。展望未来,应该考虑能否继续保持这样的增产速度。对于高产育种,应当考虑两条原则:第一,综合构成高产能力的生理学性状;第二,培育抗逆性
Over the last three decades, the average yield per unit area of wheat in the United Kingdom has doubled. By 1978, it had exceeded 5 tons per hectare and its total output almost tripled. At the same time, the sown area of wheat has also expanded. Silvey (1979) concludes from the yield test data from the National Institute of Agrobiological Research that about half of the country’s increased output is due to improved varieties. Looking ahead, we should consider whether we can continue to maintain such a rate of increase. For high-yield breeding, two principles should be considered: first, physiological traits that together make up a high-yielding capacity; and second, cultivate resistance